ceph/src/boost/libs/mpl/doc/refmanual/remove-if.html

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  12 <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./remove-if.html" class="navigation-link">remove_if</a></td>
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  14 <div class="section" id="remove-if">
  15 <h1><a class="toc-backref" href="./transformation-algorithms.html#id1492">remove_if</a></h1>
  16 <div class="section" id="id669">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename Sequence
  21     , typename Pred
  22     , typename In = <em>unspecified</em>
  23     &gt;
  24 struct <a href="./remove-if.html" class="identifier">remove_if</a>
  25 {
  26     typedef <em>unspecified</em> type;
  27 };
  28 </pre>
  29 </div>
  30 <div class="section" id="id670">
  31 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  32 <p>Returns a new sequence that contains all the elements from [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Sequence&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Sequence&gt;::type</span></tt>) range
  33 except those that satisfy the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p>
  34 <!-- Returns a copy of the original sequence with all elements satisfying the predicate
  35 ``Pred`` removed. -->
  36 <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
  37 <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
  38 details in all cases — <em>end note</em>]</p>
  39 </div>
  40 <div class="section" id="id671">
  41 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  42 <pre class="literal-block">
  43 #include &lt;<a href="../../../../boost/mpl/remove_if.hpp" class="header">boost/mpl/remove_if.hpp</a>&gt;
  44 </pre>
  45 </div>
  46 <div class="section" id="id672">
  47 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  48 <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
  49 </div>
  50 <div class="section" id="id673">
  51 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  52 <table border="1" class="docutils table">
  53 <colgroup>
  54 <col width="19%" />
  55 <col width="43%" />
  56 <col width="38%" />
  57 </colgroup>
  58 <thead valign="bottom">
  59 <tr><th class="head">Parameter</th>
  60 <th class="head">Requirement</th>
  61 <th class="head">Description</th>
  62 </tr>
  63 </thead>
  64 <tbody valign="top">
  65 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
  66 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  67 <td>An original sequence.</td>
  68 </tr>
  69 <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
  70 <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
  71 <td>A removal condition.</td>
  72 </tr>
  73 <tr><td><tt class="literal"><span class="pre">In</span></tt></td>
  74 <td><a class="reference internal" href="./inserter.html">Inserter</a></td>
  75 <td>An inserter.</td>
  76 </tr>
  77 </tbody>
  78 </table>
  79 </div>
  80 <div class="section" id="id674">
  81 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  82 <p>The semantics of an expression are defined only
  83 where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
  84 <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>, and an unary
  85 <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
  86 <pre class="literal-block">
  87 typedef <a href="./remove-if.html" class="identifier">remove_if</a>&lt;s,pred,in&gt;::type r;
  88 </pre>
  89 <table class="docutils field-list" frame="void" rules="none">
  90 <col class="field-name" />
  91 <col class="field-body" />
  92 <tbody valign="top">
  93 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
  94 </td>
  95 </tr>
  96 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
  97 <pre class="last literal-block">
  98 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
  99 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type op;
 100
 101 typedef <a href="./fold.html" class="identifier">fold</a>&lt;
 102       s
 103     , in::state
 104     , <a href="./eval-if.html" class="identifier">eval_if</a>&lt;
 105           <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>&lt;p,<a href="./placeholders.html" class="identifier">_2</a>&gt;
 106         , <a href="./identity.html" class="identifier">identity</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;
 107         , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;op,<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>&gt;
 108         &gt;
 109     &gt;::type r;
 110 </pre>
 111 </td>
 112 </tr>
 113 </tbody>
 114 </table>
 115 </div>
 116 <div class="section" id="id675">
 117 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
 118 <p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at
 119 most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
 120 </div>
 121 <div class="section" id="id676">
 122 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 123 <pre class="literal-block">
 124 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,5,2,7,5,3,5&gt;::type numbers;
 125 typedef <a href="./remove-if.html" class="identifier">remove_if</a>&lt; numbers, <a href="./greater.html" class="identifier">greater</a>&lt;_,<a href="./int.html" class="identifier">int_</a>&lt;4&gt; &gt; &gt;::type result;
 126
 127 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,<a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,2,3&gt;,<a href="./equal-to.html" class="identifier">equal_to</a>&lt;_,_&gt; > ));
 128 </pre>
 129 </div>
 130 <div class="section" id="id677">
 131 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 132 <p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./reverse-remove-if.html">reverse_remove_if</a>, <a class="reference internal" href="./remove.html">remove</a>, <a class="reference internal" href="./copy-if.html">copy_if</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p>
 133 <!-- Algorithms/Transformation Algorithms//unique |80 -->
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